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# SPDX-License-Identifier: (GPL-2.0-or-later OR BSD-2-Clause)
# pylibfdt - Tests for Flat Device Tree manipulation in Python
# Copyright (C) 2017 Google, Inc.
# Written by Simon Glass <sjg@chromium.org>
#
import struct
import sys
import types
import unittest
sys.path.insert(0, '../pylibfdt')
import libfdt
from libfdt import Fdt, FdtSw, FdtException, QUIET_NOTFOUND, QUIET_ALL
TEST_ADDR_1H = 0xdeadbeef
TEST_ADDR_1L = 0x00000000
TEST_ADDR_1 = (TEST_ADDR_1H << 32) | TEST_ADDR_1L
TEST_ADDR_1 = 0x8000000000000000
TEST_SIZE_1H = 0x00000000
TEST_SIZE_1L = 0x00100000
TEST_SIZE_1 = (TEST_SIZE_1H << 32) | TEST_SIZE_1L
TEST_ADDR_2H = 0
TEST_ADDR_2L = 123456789
TEST_ADDR_2 = (TEST_ADDR_2H << 32) | TEST_ADDR_2L
TEST_SIZE_2H = 0
TEST_SIZE_2L = 0o10000
TEST_SIZE_2 = (TEST_SIZE_2H << 32) | TEST_SIZE_2L
TEST_VALUE_1 = 0xdeadbeef
TEST_VALUE_2 = 123456789
TEST_VALUE64_1H = 0xdeadbeef
TEST_VALUE64_1L = 0x01abcdef
TEST_VALUE64_1 = (TEST_VALUE64_1H << 32) | TEST_VALUE64_1L
PHANDLE_1 = 0x2000
PHANDLE_2 = 0x2001
TEST_BYTES_1 = b'hello world'
TEST_STRING_1 = 'hello world'
TEST_STRING_2 = 'hi world'
TEST_STRING_3 = u'unicode \u01d3'
def get_err(err_code):
"""Convert an error code into an error message
Args:
err_code: Error code value (FDT_ERR_...)
Returns:
String error code
"""
return 'pylibfdt error %d: %s' % (-err_code, libfdt.strerror(-err_code))
def _ReadFdt(fname):
"""Read a device tree file into an Fdt object, ready for use
Args:
fname: Filename to read from
Returns:
Fdt bytearray suitable for passing to libfdt functions
"""
with open(fname, mode='rb') as f:
return libfdt.Fdt(f.read())
class PyLibfdtBasicTests(unittest.TestCase):
"""Test class for basic pylibfdt access functions
Properties:
fdt: Device tree file used for testing
"""
def setUp(self):
"""Read in the device tree we use for testing"""
self.fdt = _ReadFdt('test_tree1.dtb')
self.fdt2 = _ReadFdt('test_props.dtb')
self.fdt3 = _ReadFdt('aliases.dtb')
def GetPropList(self, node_path):
"""Read a list of properties from a node
Args:
node_path: Full path to node, e.g. '/subnode@1/subsubnode'
Returns:
List of property names for that node, e.g. ['compatible', 'reg']
"""
prop_list = []
node = self.fdt.path_offset(node_path)
poffset = self.fdt.first_property_offset(node, QUIET_NOTFOUND)
while poffset > 0:
prop = self.fdt.get_property_by_offset(poffset)
prop_list.append(prop.name)
poffset = self.fdt.next_property_offset(poffset, QUIET_NOTFOUND)
return prop_list
def GetSubnodes(self, node_path):
"""Read a list of subnodes from a node
Args:
node_path: Full path to node, e.g. '/subnode@1/subsubnode'
Returns:
List of subnode names for that node, e.g. ['subsubnode', 'ss1']
"""
subnode_list = []
node = self.fdt.path_offset(node_path)
offset = self.fdt.first_subnode(node, QUIET_NOTFOUND)
while offset > 0:
name = self.fdt.get_name(offset)
subnode_list.append(name)
offset = self.fdt.next_subnode(offset, QUIET_NOTFOUND)
return subnode_list
def testImport(self):
"""Check that we can import the library correctly"""
self.assertEqual(type(libfdt), types.ModuleType)
def testBadFdt(self):
"""Check that a filename provided accidentally is not accepted"""
with self.assertRaises(FdtException) as e:
fdt = libfdt.Fdt(b'a string')
self.assertEqual(e.exception.err, -libfdt.BADMAGIC)
def testSubnodeOffset(self):
"""check that we can locate a subnode by name"""
node1 = self.fdt.path_offset('/subnode@1')
self.assertEqual(self.fdt.subnode_offset(0, 'subnode@1'), node1)
with self.assertRaises(FdtException) as e:
self.fdt.subnode_offset(0, 'missing')
self.assertEqual(e.exception.err, -libfdt.NOTFOUND)
node2 = self.fdt.path_offset('/subnode@1/subsubnode')
self.assertEqual(self.fdt.subnode_offset(node1, 'subsubnode'), node2)
def testPathOffset(self):
"""Check that we can find the offset of a node"""
self.assertEqual(self.fdt.path_offset('/'), 0)
self.assertTrue(self.fdt.path_offset('/subnode@1') > 0)
with self.assertRaises(FdtException) as e:
self.fdt.path_offset('/wibble')
self.assertEqual(e.exception.err, -libfdt.NOTFOUND)
self.assertEqual(self.fdt.path_offset('/wibble', QUIET_NOTFOUND),
-libfdt.NOTFOUND)
def testPropertyOffset(self):
"""Walk through all the properties in the root node"""
offset = self.fdt.first_property_offset(0)
self.assertTrue(offset > 0)
for i in range(5):
next_offset = self.fdt.next_property_offset(offset)
self.assertTrue(next_offset > offset)
offset = next_offset
self.assertEqual(self.fdt.next_property_offset(offset, QUIET_NOTFOUND),
-libfdt.NOTFOUND)
def testPropertyOffsetExceptions(self):
"""Check that exceptions are raised as expected"""
with self.assertRaises(FdtException) as e:
self.fdt.first_property_offset(107)
self.assertEqual(e.exception.err, -libfdt.BADOFFSET)
# Quieten the NOTFOUND exception and check that a BADOFFSET
# exception is still raised.
with self.assertRaises(FdtException) as e:
self.fdt.first_property_offset(107, QUIET_NOTFOUND)
self.assertEqual(e.exception.err, -libfdt.BADOFFSET)
with self.assertRaises(FdtException) as e:
self.fdt.next_property_offset(107, QUIET_NOTFOUND)
self.assertEqual(e.exception.err, -libfdt.BADOFFSET)
# Check that NOTFOUND can be quietened.
node = self.fdt.path_offset('/subnode@1/ss1')
self.assertEqual(self.fdt.first_property_offset(node, QUIET_NOTFOUND),
-libfdt.NOTFOUND)
with self.assertRaises(FdtException) as e:
self.fdt.first_property_offset(node)
self.assertEqual(e.exception.err, -libfdt.NOTFOUND)
def testGetName(self):
"""Check that we can get the name of a node"""
self.assertEqual(self.fdt.get_name(0), '')
node = self.fdt.path_offset('/subnode@1/subsubnode')
self.assertEqual(self.fdt.get_name(node), 'subsubnode')
with self.assertRaises(FdtException) as e:
self.fdt.get_name(-2)
self.assertEqual(e.exception.err, -libfdt.BADOFFSET)
def testGetPropertyByOffset(self):
"""Check that we can read the name and contents of a property"""
root = 0
poffset = self.fdt.first_property_offset(root)
prop = self.fdt.get_property_by_offset(poffset)
self.assertEqual(prop.name, 'compatible')
self.assertEqual(prop, b'test_tree1\0')
with self.assertRaises(FdtException) as e:
self.fdt.get_property_by_offset(-2)
self.assertEqual(e.exception.err, -libfdt.BADOFFSET)
self.assertEqual(
-libfdt.BADOFFSET,
self.fdt.get_property_by_offset(-2, [libfdt.BADOFFSET]))
def testGetProp(self):
"""Check that we can read the contents of a property by name"""
root = self.fdt.path_offset('/')
value = self.fdt.getprop(root, "compatible")
self.assertEqual(value, b'test_tree1\0')
self.assertEqual(-libfdt.NOTFOUND, self.fdt.getprop(root, 'missing',
QUIET_NOTFOUND))
with self.assertRaises(FdtException) as e:
self.fdt.getprop(root, 'missing')
self.assertEqual(e.exception.err, -libfdt.NOTFOUND)
node = self.fdt.path_offset('/subnode@1/subsubnode')
value = self.fdt.getprop(node, "compatible")
self.assertEqual(value, b'subsubnode1\0subsubnode\0')
def testStrError(self):
"""Check that we can get an error string"""
self.assertEqual(libfdt.strerror(-libfdt.NOTFOUND),
'FDT_ERR_NOTFOUND')
def testNextNodeOffset(self):
"""Check that we can walk through nodes"""
node_list = []
node = 0
depth = 0
while depth >= 0:
node_list.append([depth, self.fdt.get_name(node)])
node, depth = self.fdt.next_node(node, depth, (libfdt.BADOFFSET,))
self.assertEqual(node_list, [
[0, ''],
[1, 'subnode@1'],
[2, 'subsubnode'],
[2, 'ss1'],
[1, 'subnode@2'],
[2, 'subsubnode@0'],
[2, 'ss2'],
])
def testFirstNextSubnodeOffset(self):
"""Check that we can walk through subnodes"""
node_list = []
node = self.fdt.first_subnode(0, QUIET_NOTFOUND)
while node >= 0:
node_list.append(self.fdt.get_name(node))
node = self.fdt.next_subnode(node, QUIET_NOTFOUND)
self.assertEqual(node_list, ['subnode@1', 'subnode@2'])
def testFirstNextSubnodeOffsetExceptions(self):
"""Check except handling for first/next subnode functions"""
node = self.fdt.path_offset('/subnode@1/subsubnode', QUIET_NOTFOUND)
self.assertEqual(self.fdt.first_subnode(node, QUIET_NOTFOUND),
-libfdt.NOTFOUND)
with self.assertRaises(FdtException) as e:
self.fdt.first_subnode(node)
self.assertEqual(e.exception.err, -libfdt.NOTFOUND)
node = self.fdt.path_offset('/subnode@1/ss1', QUIET_NOTFOUND)
self.assertEqual(self.fdt.next_subnode(node, QUIET_NOTFOUND),
-libfdt.NOTFOUND)
with self.assertRaises(FdtException) as e:
self.fdt.next_subnode(node)
self.assertEqual(e.exception.err, -libfdt.NOTFOUND)
def testDeleteProperty(self):
"""Test that we can delete a property"""
node_name = '/subnode@1'
self.assertEqual(self.GetPropList(node_name),
['compatible', 'reg', 'prop-int'])
node = self.fdt.path_offset('/%s' % node_name)
self.assertEqual(self.fdt.delprop(node, 'reg'), 0)
self.assertEqual(self.GetPropList(node_name),
['compatible', 'prop-int'])
def testHeader(self):
"""Test that we can access the header values"""
self.assertEqual(self.fdt.magic(), 0xd00dfeed)
self.assertEqual(self.fdt.totalsize(), len(self.fdt._fdt))
self.assertEqual(self.fdt.off_dt_struct(), 88)
self.assertEqual(self.fdt.off_dt_strings(), 652)
self.assertEqual(self.fdt.off_mem_rsvmap(), 40)
self.assertEqual(self.fdt.version(), 17)
self.assertEqual(self.fdt.last_comp_version(), 16)
self.assertEqual(self.fdt.boot_cpuid_phys(), 0)
self.assertEqual(self.fdt.size_dt_strings(), 105)
self.assertEqual(self.fdt.size_dt_struct(), 564)
def testPack(self):
"""Test that we can pack the tree after deleting something"""
orig_size = self.fdt.totalsize()
node = self.fdt.path_offset('/subnode@2', QUIET_NOTFOUND)
self.assertEqual(self.fdt.delprop(node, 'prop-int'), 0)
self.assertEqual(orig_size, self.fdt.totalsize())
self.assertEqual(self.fdt.pack(), 0)
self.assertTrue(self.fdt.totalsize() < orig_size)
self.assertEqual(self.fdt.totalsize(), len(self.fdt.as_bytearray()))
def testBadPropertyOffset(self):
"""Test that bad property offsets are detected"""
with self.assertRaises(FdtException) as e:
self.fdt.get_property_by_offset(13)
self.assertEqual(e.exception.err, -libfdt.BADOFFSET)
with self.assertRaises(FdtException) as e:
self.fdt.first_property_offset(3)
self.assertEqual(e.exception.err, -libfdt.BADOFFSET)
with self.assertRaises(FdtException) as e:
self.fdt.next_property_offset(3)
self.assertEqual(e.exception.err, -libfdt.BADOFFSET)
def testBadPathOffset(self):
"""Test that bad path names are detected"""
with self.assertRaisesRegex(FdtException, get_err(libfdt.BADPATH)):
self.fdt.path_offset('not-present')
def testQuietAll(self):
"""Check that exceptions can be masked by QUIET_ALL"""
self.assertEqual(-libfdt.NOTFOUND,
self.fdt.path_offset('/missing', QUIET_ALL))
self.assertEqual(-libfdt.BADOFFSET,
self.fdt.get_property_by_offset(13, QUIET_ALL))
self.assertEqual(-libfdt.BADPATH,
self.fdt.path_offset('missing', QUIET_ALL))
def testIntegers(self):
"""Check that integers can be passed and returned"""
self.assertEqual(0, libfdt.fdt_get_phandle(self.fdt._fdt, 0))
node2 = self.fdt.path_offset('/subnode@2')
self.assertEqual(0x2000, libfdt.fdt_get_phandle(self.fdt._fdt, node2))
def testGetPhandle(self):
"""Test for the get_phandle() method"""
self.assertEqual(0, self.fdt.get_phandle(0))
node2 = self.fdt.path_offset('/subnode@2')
self.assertEqual(0x2000, self.fdt.get_phandle(node2))
def testGetAlias(self):
"""Test for the get_alias() method"""
self.assertEqual("/subnode@1", self.fdt3.get_alias('s1'))
self.assertEqual("/subnode@1/subsubnode", self.fdt3.get_alias('ss1'))
self.assertEqual("/subnode@1/subsubnode/subsubsubnode", self.fdt3.get_alias('sss1'))
def testParentOffset(self):
"""Test for the parent_offset() method"""
self.assertEqual(-libfdt.NOTFOUND,
self.fdt.parent_offset(0, QUIET_NOTFOUND))
with self.assertRaises(FdtException) as e:
self.fdt.parent_offset(0)
self.assertEqual(e.exception.err, -libfdt.NOTFOUND)
node1 = self.fdt.path_offset('/subnode@2')
self.assertEqual(0, self.fdt.parent_offset(node1))
node2 = self.fdt.path_offset('/subnode@2/subsubnode@0')
self.assertEqual(node1, self.fdt.parent_offset(node2))
def testNodeOffsetByPhandle(self):
"""Test for the node_offset_by_phandle() method"""
self.assertEqual(-libfdt.NOTFOUND,
self.fdt.node_offset_by_phandle(1, QUIET_NOTFOUND))
node1 = self.fdt.path_offset('/subnode@2')
self.assertEqual(node1, self.fdt.node_offset_by_phandle(0x2000))
node2 = self.fdt.path_offset('/subnode@2/subsubnode@0')
self.assertEqual(node2, self.fdt.node_offset_by_phandle(0x2001))
def get_prop(self, name):
return self.fdt2.getprop(0, name)
def testGetIntProperties(self):
"""Test that we can access properties as integers"""
self.assertEqual(0xdeadbeef, self.get_prop("prop-hex32").as_uint32())
self.assertEqual(123, self.get_prop("prop-uint32").as_uint32())
self.assertEqual(-2, self.get_prop("prop-int32").as_int32())
self.assertEqual(9223372036854775807,
self.get_prop("prop-uint64").as_uint64())
self.assertEqual(-2, self.get_prop("prop-int64").as_int64())
def testReserveMap(self):
"""Test that we can access the memory reserve map"""
self.assertEqual(2, self.fdt.num_mem_rsv())
self.assertEqual([ 0xdeadbeef00000000, 0x100000],
self.fdt.get_mem_rsv(0))
self.assertEqual([123456789, 0o10000], self.fdt.get_mem_rsv(1))
def testEmpty(self):
"""Test that we can create an empty tree"""
self.assertEqual(-libfdt.NOSPACE,
Fdt.create_empty_tree(1, (libfdt.NOSPACE,)))
fdt = Fdt.create_empty_tree(128)
self.assertEqual(128, fdt.totalsize())
def testOpenInto(self):
"""Test that we can resize a tree"""
fdt = Fdt.create_empty_tree(128)
self.assertEqual(128, fdt.totalsize())
fdt.resize(256)
self.assertEqual(256, fdt.totalsize())
fdt.pack()
self.assertTrue(fdt.totalsize() < 128)
def testSetProp(self):
"""Test that we can update and create properties"""
node = self.fdt.path_offset('/subnode@1')
self.fdt.setprop(node, 'compatible', TEST_BYTES_1)
self.assertEqual(TEST_BYTES_1, self.fdt.getprop(node, 'compatible'))
# Check that this property is missing, and that we don't have space to
# add it
self.assertEqual(-libfdt.NOTFOUND,
self.fdt.getprop(node, 'missing', QUIET_NOTFOUND))
self.assertEqual(-libfdt.NOSPACE,
self.fdt.setprop(node, 'missing', TEST_BYTES_1,
quiet=(libfdt.NOSPACE,)))
# Expand the device tree so we now have room
self.fdt.resize(self.fdt.totalsize() + 50)
self.fdt.setprop(node, 'missing', TEST_BYTES_1)
self.assertEqual(TEST_BYTES_1, self.fdt.getprop(node, 'missing'))
def testSetPropU32(self):
"""Test that we can update and create integer properties"""
node = 0
prop = 'prop-int'
self.fdt.setprop_u32(node, prop, TEST_VALUE_1)
self.assertEqual(struct.pack('>I', TEST_VALUE_1),
self.fdt.getprop(node, prop))
def testSetPropU64(self):
"""Test that we can update and create integer properties"""
node = 0
prop = 'prop-int64'
self.fdt.setprop_u64(node, prop, TEST_VALUE64_1)
self.assertEqual(struct.pack('>Q', TEST_VALUE64_1),
self.fdt.getprop(node, prop))
def testSetPropStr(self):
"""Test that we can set a property to a particular string"""
node = 0
prop = 'prop-str'
self.assertEqual(TEST_STRING_1, self.fdt.getprop(node, prop).as_str())
self.fdt.setprop_str(node, prop, TEST_STRING_2)
self.assertEqual(TEST_STRING_2, self.fdt.getprop(node, prop).as_str())
with self.assertRaises(ValueError) as e:
self.fdt.getprop(node, 'prop-int').as_str()
self.assertIn('lacks nul termination', str(e.exception))
node2 = self.fdt.path_offset('/subnode@1/subsubnode')
with self.assertRaises(ValueError) as e:
self.fdt.getprop(node2, 'compatible').as_str()
self.assertIn('embedded nul', str(e.exception))
# Expand the device tree so we now have room
self.fdt.resize(self.fdt.totalsize() + 50)
prop = 'prop-unicode'
self.fdt.setprop_str(node, prop, TEST_STRING_3)
self.assertEqual(TEST_STRING_3,
self.fdt.getprop(node, prop).as_str())
def testSetName(self):
"""Test that we can update a node name"""
node = self.fdt.path_offset('/subnode@1')
old_val = self.fdt.get_name(node)
self.fdt.set_name(node, 'test')
self.assertEqual('test', self.fdt.get_name(node))
with self.assertRaises(ValueError) as e:
self.fdt.set_name(node, 'some\0name')
self.assertIn('embedded nul', str(e.exception))
with self.assertRaises(ValueError) as e:
self.fdt.set_name(node, 'name\0')
self.assertIn('embedded nul', str(e.exception))
def testAddDeleteNodes(self):
"""Test that we can add and delete nodes"""
node_name = '/subnode@1'
self.assertEqual(self.GetSubnodes(node_name), ['subsubnode', 'ss1'])
node = self.fdt.path_offset('%s/subsubnode' % node_name)
self.assertEqual(self.fdt.del_node(node, 'subsubnode'), 0)
self.assertEqual(self.GetSubnodes(node_name), ['ss1'])
node = self.fdt.path_offset(node_name)
offset = self.fdt.add_subnode(node, 'more')
self.assertTrue(offset > 0)
self.assertEqual(self.GetSubnodes(node_name), ['more', 'ss1'])
class PyLibfdtSwTests(unittest.TestCase):
"""Test class for pylibfdt sequential-write DT creation
"""
def assertOk(self, err_code):
self.assertEqual(0, err_code)
def testCreate(self):
# First check the minimum size and also the FdtSw() constructor
with self.assertRaisesRegex(FdtException, get_err(libfdt.NOSPACE)):
self.assertEqual(-libfdt.NOSPACE, FdtSw(3))
sw = FdtSw()
sw.add_reservemap_entry(TEST_ADDR_1, TEST_SIZE_1)
sw.add_reservemap_entry(TEST_ADDR_2, TEST_SIZE_2)
sw.finish_reservemap()
sw.begin_node('')
sw.property_string('compatible', 'test_tree1')
sw.property_u32('prop-int', TEST_VALUE_1)
sw.property_u32('prop-int', TEST_VALUE_1)
sw.property_u64('prop-int64', TEST_VALUE64_1)
sw.property_string('prop-str', TEST_STRING_1)
sw.property_u32('#address-cells', 1)
sw.property_u32('#size-cells', 0)
sw.begin_node('subnode@1')
sw.property_string('compatible', 'subnode1')
sw.property_u32('reg', 1)
sw.property_cell('prop-int', TEST_VALUE_1)
sw.property('data', b'\x00data\x01')
sw.begin_node('subsubnode')
sw.property('compatible', b'subsubnode1\0subsubnode')
sw.property_cell('prop-int', TEST_VALUE_1)
sw.end_node()
sw.begin_node('ss1')
sw.end_node()
sw.end_node()
for i in range(2, 11):
with sw.add_node('subnode@%d' % i):
sw.property_u32('reg', 2)
sw.property_cell('linux,phandle', PHANDLE_1)
sw.property_cell('prop-int', TEST_VALUE_2)
sw.property_u32('#address-cells', 1)
sw.property_u32('#size-cells', 0)
with sw.add_node('subsubnode@0'):
sw.property_u32('reg', 0)
sw.property_cell('phandle', PHANDLE_2)
sw.property('compatible', b'subsubnode2\0subsubnode')
sw.property_cell('prop-int', TEST_VALUE_2)
with sw.add_node('ss2'):
pass
sw.end_node()
fdt = sw.as_fdt()
self.assertEqual(2, fdt.num_mem_rsv())
self.assertEqual([TEST_ADDR_1, TEST_SIZE_1], fdt.get_mem_rsv(0))
# Make sure we can add a few more things
with sw.add_node('another'):
sw.property_u32('reg', 3)
# Make sure we can read from the tree too
node = sw.path_offset('/subnode@1')
self.assertEqual(b'subnode1\0', sw.getprop(node, 'compatible'))
# Make sure we did at least two resizes
self.assertTrue(len(fdt.as_bytearray()) > FdtSw.INC_SIZE * 2)
class PyLibfdtRoTests(unittest.TestCase):
"""Test class for read-only pylibfdt access functions
This just tests a few simple cases. Most of the tests are in
PyLibfdtBasicTests.
Properties:
fdt: Device tree file used for testing
"""
def setUp(self):
"""Read in the device tree we use for testing"""
with open('test_tree1.dtb', mode='rb') as f:
self.fdt = libfdt.FdtRo(f.read())
def testAccess(self):
"""Basic sanity check for the FdtRo class"""
node = self.fdt.path_offset('/subnode@1')
self.assertEqual(b'subnode1\0',
self.fdt.getprop(node, 'compatible'))
node = self.fdt.first_subnode(node)
self.assertEqual(b'this is a placeholder string\0string2\0',
self.fdt.getprop(node, 'placeholder'))
if __name__ == "__main__":
unittest.main()